I've always done
if (test == null || test.trim().equalsIgnoreCase("")) { }(I'm anal about always using equalsIgnoreCase unless I know for sure that case sensitivity is required). No need to do anything more complex than that in my experience. "Always do the simplest thing that will work".
Frank
From: Robert Bateman <[EMAIL PROTECTED]> Reply-To: "Tomcat Users List" <[EMAIL PROTECTED]> To: "Tomcat Users List" <[EMAIL PROTECTED]> Subject: Re: how to check if a String is empty? Date: Fri, 18 Jun 2004 12:58:30 -0400
Wouldn't test.trim().length() be a better test? length() after trm would tell you if non white-space was left.
Bob
On Thursday 24 June 2004 12:30 pm, Peter Guyatt wrote: > Hi There, > > You could do the check test.length() > 0 > > Pete > > -----Original Message----- > From: Carl Olivier [mailto:[EMAIL PROTECTED] > Sent: 24 June 2004 17:18 > To: 'Tomcat Users List' > Subject: RE: how to check if a String is empty? > > > There is a trim() funtion in java.lang.String > > ? > > -----Original Message----- > From: Marten Lehmann [mailto:[EMAIL PROTECTED] > Sent: 24 June 2004 06:20 PM > To: 'Tomcat Users List' > Subject: how to check if a String is empty? > > > Hello, > > maybe this is not the perfect group for my question, but as my problem > appears at the development of JSPs and tomcat is concerned with that, I > hope you can answer it. > > I often see the condition > > String test = req.getParameter("test"); > > if (test == null) { > /* string is empty */ > } else { > /* string contains something */ > } > > But if test contains just blanks and other whitespaces, it's not null, > but doesn't contain usable data anyhow. How can I check if a string > contains whitespaces only? I though of something like > > if (test == null || test.trim().equals("")) { > } > > but there's no trim()-function, right? How do you solve this problem? > With whitespaces I mean blanks, tabs and newlines. > > Regards > Marten >
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